転倒降伏耐震壁の提案とその構造特性に関する解析的研究

概要

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A new composite shear wall system, proposeded by authors, is composed of coupling steel girders that, under large earthquakes, behave as dampers, and two RC wall panels that remain elastic and perform as a flexural column that reduces variation of story deformation along height of the building. Tension induced in the wall base is controlled by ultimate shear strength of the coupling girders. A simple design method on this system is suggested, which exploits these structural characters of the system and treats overturning moment as the wall's capacity indicator. Prototype buildings are designed using this method, which are then used to study dynamic behavior of the wall-frame structures. The results suggest that variation of maximum story angles along height is significantly reduced to 30% of the average story angle when this shear wall system is employed, regardless of the base shear capacity and yield mechanism of the frames. The hysteretic damper is effective in reducing the maximum average story angle, especially if the shear wall carries larger overturning moment.
社団法人日本建築学会の論文
2005-01-30